The Raspberry Pi adaptor board allows you to connect a Raspberry Pi device to downstream E-blocks boards, including the prototype board, using a 26 way IDC cable. Circuitry on the adaptor board offers protection for the Raspberry Pi pins from short circuits to ground or the supply voltage and presents the 17 general purpose I/O pins on D-type E-blocks connectors. Additional zener diodes can be added to the board to offer further protection for the RPi I/O lines from negative voltages or shorts to a voltage greater than the supply voltage. All the standard signals from the Raspberry Pi GPIO bus are brought across onto the adapter board including the voltage supply pins. The adapter board can also be used with a standard Matrix DC Power supply (order code HP2666) to provide power to the Raspberry Pi board.